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US6666078B1 - Target tire pressure learning method - Google Patents

Target tire pressure learning method Download PDF

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Publication number
US6666078B1
US6666078B1 US10/006,276 US627601A US6666078B1 US 6666078 B1 US6666078 B1 US 6666078B1 US 627601 A US627601 A US 627601A US 6666078 B1 US6666078 B1 US 6666078B1
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US
United States
Prior art keywords
pressure
conduit
tire
tire pressure
control unit
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US10/006,276
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English (en)
Inventor
Stephen P. Claussen
James A. Beverly
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Dana Heavy Vehicle Systems Group LLC
Original Assignee
Dana Inc
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Publication date
Application filed by Dana Inc filed Critical Dana Inc
Assigned to DANA CORPORATION reassignment DANA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BEVERLY, JAMES A., CLAUSSEN, STEPHEN P.
Priority to US10/006,276 priority Critical patent/US6666078B1/en
Priority to BRPI0215562-1A priority patent/BR0215562B1/pt
Priority to AT02784612T priority patent/ATE385914T1/de
Priority to CNB028278062A priority patent/CN100335880C/zh
Priority to CA2473968A priority patent/CA2473968C/en
Priority to DE60225049T priority patent/DE60225049T2/de
Priority to PCT/US2002/037934 priority patent/WO2003047888A1/en
Priority to EP02784612A priority patent/EP1453689B1/de
Priority to MXPA04006518A priority patent/MXPA04006518A/es
Priority to AU2002346544A priority patent/AU2002346544A1/en
Publication of US6666078B1 publication Critical patent/US6666078B1/en
Application granted granted Critical
Assigned to DANA HEAVY VEHICLE SYSTEMS GROUP, LLC reassignment DANA HEAVY VEHICLE SYSTEMS GROUP, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DANA CORPORATION
Assigned to CITICORP USA, INC. reassignment CITICORP USA, INC. INTELLECTUAL PROPERTY TERM FACILITY SECURITY AGREEMENT Assignors: DANA AUTOMOTIVE AFTERMARKET, INC., DANA AUTOMOTIVE SYSTEMS GROUP, LLC, DANA COMMERCIAL VEHICLE MANUFACTURING, LLC, DANA COMMERCIAL VEHICLE PRODUCTS, LLC, DANA DRIVESHAFT MANUFACTURING, LLC, DANA DRIVESHAFT PRODUCTS, LLC, DANA GLOBAL PRODUCTS, INC., DANA HEAVY VEHICLE SYSTEMS GROUP, LLC, DANA HOLDING CORPORATION, DANA LIGHT AXLE MANUFACTURING, LLC, DANA LIGHT AXLE PRODUCTS, LLC, DANA LIMITED, DANA OFF HIGHWAY PRODUCTS, LLC, DANA SEALING MANUFACTURING, LLC, DANA SEALING PRODUCTS, LLC, DANA STRUCTURAL MANUFACTURING, LLC, DANA STRUCTURAL PRODUCTS, LLC, DANA THERMAL PRODUCTS, LLC, DANA WORLD TRADE CORPORATION, DTF TRUCKING INC., SPICER HEAVY AXLE & BRAKE, INC.
Assigned to CITICORP USA, INC. reassignment CITICORP USA, INC. INTELLECTUAL PROPERTY REVOLVING FACILITY SECURITY AGREEMENT Assignors: DANA AUTOMOTIVE AFTERMARKET, INC., DANA AUTOMOTIVE SYSTEMS GROUP, LLC, DANA COMMERCIAL VEHICLE MANUFACTURING, LLC, DANA COMMERCIAL VEHICLE PRODUCTS, LLC, DANA DRIVESHAFT MANUFACTURING, LLC, DANA DRIVESHAFT PRODUCTS, LLC, DANA GLOBAL PRODUCTS, INC., DANA HEAVY VEHICLE SYSTEMS GROUP, LLC, DANA HOLDING CORPORATION, DANA LIGHT AXLE MANUFACTURING, LLC, DANA LIGHT AXLE PRODUCTS, LLC, DANA LIMITED, DANA OFF HIGHWAY PRODUCTS, LLC, DANA SEALING MANUFACTURING, LLC, DANA SEALING PRODUCTS, LLC, DANA STRUCTURAL MANUFACTURING, LLC, DANA STRUCTURAL PRODUCTS, LLC, DANA THERMAL PRODUCTS, LLC, DANA WORLD TRADE CORPORATION, DTF TRUCKING INC., SPICER HEAVY AXLE & BRAKE, INC.
Assigned to CITIBANK, N.A. reassignment CITIBANK, N.A. SECURITY AGREEMENT (BRIDGE) Assignors: DANA AUTOMOTIVE SYSTEMS GROUP, LLC, DANA HEAVY VEHICLE SYSTEMS GROUP, LLC, DANA LIMITED, FAIRFIELD MANUFACTURING COMPANY, INC.
Assigned to CITIBANK, N.A. reassignment CITIBANK, N.A. SECURITY AGREEMENT SUPPLEMENT Assignors: DANA AUTOMOTIVE SYSTEMS GROUP, LLC, DANA HEAVY VEHICLE SYSTEMS GROUP, LLC, DANA LIMITED, FAIRFIELD MANUFACTURING COMPANY, INC.
Assigned to FAIRFIELD MANUFACTURING COMPANY, INC., DANA LIMITED, DANA AUTOMOTIVE SYSTEMS GROUP, LLC, DANA HEAVY VEHICLE SYSTEMS GROUP, LLC reassignment FAIRFIELD MANUFACTURING COMPANY, INC. RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CITIBANK, N.A.
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/001—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving
    • B60C23/003—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving comprising rotational joints between vehicle-mounted pressure sources and the tyres
    • B60C23/00372—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving comprising rotational joints between vehicle-mounted pressure sources and the tyres characterised by fluid diagrams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/001—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving
    • B60C23/003—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving comprising rotational joints between vehicle-mounted pressure sources and the tyres
    • B60C23/00309—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving comprising rotational joints between vehicle-mounted pressure sources and the tyres characterised by the location of the components, e.g. valves, sealings, conduits or sensors
    • B60C23/00318—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving comprising rotational joints between vehicle-mounted pressure sources and the tyres characterised by the location of the components, e.g. valves, sealings, conduits or sensors on the wheels or the hubs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/001—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving
    • B60C23/003—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving comprising rotational joints between vehicle-mounted pressure sources and the tyres
    • B60C23/00354—Details of valves

Definitions

  • CTI systems central tire inflation systems
  • traction systems Conventional tire pressure management systems typically have central tire inflation systems (CTI systems), also known as on-board inflation systems and traction systems.
  • CTI systems central tire inflation systems
  • traction systems Conventional tire pressure management systems are well known, as may be seen by reference to the following U.S. Pat. Nos.: 5,516,379; 5,313,995; 5,273,064; 5,253,687; 5,180,456; 5,179,981; 5,174,839; 5,121,774; 4,924,926; 4,922,946; 4,917,163; 4,893,664; 4,883,106; 4,883,105; 4,825,925; 4,782,879; 4,754,792; 4,724,879; 4,678,017; 4,640,331; and 4,619,303.
  • CTI systems central tire inflation systems
  • tire pressure management systems employ a pneumatically controlled wheel valve that is affixed to each vehicle wheel assembly for controlling tire pressure in response to pressure signals from a fluid control circuit.
  • the fluid control circuit is connected to each wheel valve via a rotary seal assembly associated with each wheel valve.
  • tire pressure is monitored by means of a sensor that is positioned in a conduit assembly in the fluid control circuit. When the wheel valve and certain control valves are opened, the pressure in the conduit assembly equalizes to tire pressure which can be sensed by the sensor.
  • An electronic control unit receives electrical pressure signals generated by the sensor and appropriately controls the fluid control circuit in response thereto for inflating or deflating a selected tire.
  • Prior vehicular systems which use pressure sensors/transmitters located in each tire that transmit pressure information to a receiver.
  • Each sensor/transmitter may have an identification code associated therewith which enables the receiver to know which sensor/transmitter the pressure information is received from.
  • the receiver analyzes the pressure information and, in some systems, displays current pressure information to the vehicle's operator via a mounted display.
  • Some systems also contemplate the provision of a warning signal to the operator in the situation where the tire pressure is determined to be low. See, for example, U.S. Pat. No. 5,600,301, the disclosure of which is incorporated herein.
  • Some tire pressure maintenance systems provide for “learning” a tire pressure by measuring and registering the pressure of a particular tire. However, such systems either are limited to multiple, tire-designated pressure sensor applications or do not include the learning of an ultimate target tire pressure. See, for example, U.S. Pat. Nos. 6,246,317 and 5, 309,969.
  • target tire pressure learning tire management systems which dedicate a pressure sensor to each tire for measure the fluid pressure therein is costly and limits utility to only those vehicles having tire-specific pressure sensors. What is needed is a target tire pressure learning method wherein tire pressure is ascertained via a central pressure sensor.
  • the invention provides a target tire pressure learning method wherein tire pressure is ascertained via a central pressure sensor.
  • the method of learning a target tire pressure for a tire maintained by a tire pressure maintenance system, having conduit assemblies for conducting fluid to and/or from the tire and a pressure sensor for ascertaining fluid pressure in the conduit assemblies, according to the invention includes ascertaining a current tire pressure with the pressure sensor and designating the current tire pressure as a target tire pressure.
  • FIG. 1 is a diagrammatic view of a tire pressure management system for a vehicle, a vehicle incorporating same being shown in dotted line;
  • FIG. 2 is a cross-sectional detail view of a conventional vehicle wheel assembly
  • FIG. 3 is a schematic view of components of the system of FIG. 1;
  • FIG. 4 is a schematic view of a flow chart for a method configured according to the invention.
  • the invention is a target tire pressure learning method wherein tire pressure is ascertained via a central pressure sensor.
  • “Target tire pressure,” as used herein, means the final tire pressure desired during steady state operation of a vehicle.
  • “Target tire pressure” does not include temporary values accessed or manipulated in the course of obtaining a final tire pressure. The method may be achieved with known tire pressure management systems, such as the exemplary tire pressure management system described below.
  • FIG. 1 shows a tire pressure management system 10 for a vehicle 12 for describing, but not limiting applicability of the invention.
  • Vehicle 12 may be, but is not limited to being a tractor-trailer.
  • the system may be used in connection with a wide variety of vehicles, including automobiles.
  • Vehicle 12 may include a plurality of axles, including a steer axle 14 , a tandem axle assembly having drive axles 16 , 18 and another tandem axle assembly having trailer axles 20 , 22 .
  • each axle such as drive axle 14
  • each axle may include wheels 24 affixed to wheel hubs 26 disposed at each outboard end of the axle and rotationally supported on axle 14 .
  • Each wheel 24 may include one or more inflatable tires 28 mounted thereon.
  • System 10 monitors and controls pressure within each tire 28 of vehicle 12 .
  • System 10 may include wheel valve assemblies 30 , a fluid source 32 , a vacuum source 34 , and a fluid control circuit 36 .
  • System 10 may further include at least a sensor 200 , one or more electronic control units 42 , one or more load sensors 44 , a speed sensor 46 , and an operator control device 48 .
  • Wheel valve assemblies 30 are provided to control the flow of pressurized fluid into and out of tires 28 .
  • Valve assembly 30 is mounted to each end of each axle and is connected to the remainder of system 10 through a rotary seal connection 50 .
  • Wheel valve assembly 30 is conventional in the art and may include the wheel valve assembly described and illustrated in U.S. Pat. No. 5,253,687 or U.S. Pat. No. 6,250,327, the entire disclosures of which are incorporated herein.
  • Rotary seal assembly 50 also is conventional in the art and may include the rotary seal assembly described and illustrated in U.S. Pat. No. 5,174,839, the entire disclosure of which also is incorporated herein.
  • wheel valve assembly 30 may include an inlet port 30 a coupled to a rotatable port 50 b of rotary seal assembly 50 , an outlet port 30 b in fluid communication with the interior of tire 28 , and an exhaust port 30 c , best shown in FIG. 1 .
  • Rotary seal assembly 50 may further include a non-rotatable port 50 a connected to a conduit 52 of fluid control circuit 36 .
  • Valve assembly 30 assumes a closed position, as illustrated in FIG.
  • Fluid source 32 provides positive pressurized fluid to system 10 and tires 28 .
  • Fluid source 32 is conventional in the art and may include a pressure source, such as a pump 54 , an air dryer 56 , and a first fluid tank 58 connected via a conduit 60 to the brake system fluid tanks 62 , 64 and to the fluid control circuit 36 via a branch conduit 60 a .
  • Check valves 66 prevent sudden loss of fluid pressure in brake tanks 62 , 64 in the event of upstream pressure loss.
  • a pressure sensor 68 monitors pressure within tank 58 and provides a pressure indicative signal to electronic control unit 42 .
  • Vacuum source 34 produces a negative pressure in system 10 to decrease fluid pressure in tires 28 of vehicle 12 .
  • Vacuum. source 34 also is conventional in the art and may include a vacuum generator 70 controlled through a solenoid valve 72 .
  • a low pressure zone is produced by passing fluid through a venturi like portion of vacuum generator 70 .
  • solenoid valve 72 Upon urging solenoid valve 72 into an open position via a control signal from electronic control unit 42 , a vacuum or negative fluid pressure, relative to atmospheric pressure, is introduced in a conduit 74 , which has a small orifice 76 disposed proximate the low pressure zone produced by generator 70 .
  • Conduit 74 also is connected to a one-way vent valve 78 for rapid venting of positive fluid pressure from conduit 74 .
  • Vent valve 78 includes a valving member 80 that is drawn into a closed position in response to negative fluid pressure in conduit 74 and is urged into an open position in response to positive pressure fluid in conduit 74 .
  • Fluid control circuit 36 directs the flow of pressurized fluid within system 10 for controlling pressure in tires 28 of vehicle 12 .
  • Control circuit 36 may include a pair of pressure control valves 82 , 84 and a plurality of axle distribution valves 86 , 88 , 90 . As shown, a single fluid control circuit 36 controls pressure in all of the tires 28 of vehicle 12 . However, control circuit 36 , and other portions of system 10 , may be replicated so that, for example, one control circuit 36 may control tire pressures in the tractor portion of vehicle 12 and another control circuit 36 may control tire pressure in the trailer portion of vehicle 12 .
  • Valve 82 directs positive pressurized fluid from fluid source 32 to tires 28 of vehicle 12 .
  • Valve 82 may include a conventional two position-two way, solenoid controlled and pilot fluid operated valve.
  • Valve 82 includes a valving member 92 that is spring biased toward a closed position, as shown in FIG. 1 .
  • Valving member 92 assumes an open position in response to energizing of a solenoid operatively associated therewith via control signals from electronic control unit 42 .
  • Valve 82 has a first port 82 a coupled to a conduit 94 leading to fluid source 32 .
  • Valve 82 has a second port 82 b coupled to another conduit 96 leading to axle distribution valves 86 , 88 , 90 .
  • Valve 84 vents control circuit 36 .
  • Valve 84 is conventional in the art and may also include a two position-two way, solenoid controlled and pilot fluid operated valve.
  • Valve 84 includes a valving member 98 that is spring biased toward an open position, as shown in FIG. 1 .
  • Valving member 98 assumes a closed position in response to energizing a solenoid operatively associated therewith via control signals from electronic control unit 42 .
  • Valve 84 has a first port 84 a coupled to conduit 74 leading to orifice 76 .
  • Valve 84 has a second port 84 b coupled to conduit 96 leading to axle distribution valves 86 , 88 , 90 .
  • Axle distribution valves 86 , 88 , 90 limit the supply of positive pressurized fluid to, or the release of fluid from, the tires 28 of one or more axles 14 , 16 , 18 , 20 , 22 of vehicle 12 .
  • Valves 86 , 88 , 90 are conventional in the art and may include two position-two way, solenoid controlled and pilot fluid operated valves. Valves 86 , 88 , 90 direct the flow of fluid to and from the tires 28 of axles 14 , 16 and 18 , and 20 and 22 , respectively.
  • Each of valves 86 , 88 , 90 includes a valving member 100 , 102 , 104 , respectively, that is spring-biased toward an open position, as shown in FIG.
  • valves 86 , 88 , 90 respectively has first ports 86 a , 88 a , 90 a coupled to conduit 96 .
  • valves 86 , 88 , 90 respectively has second ports 86 b , 88 b , 90 b leading to respective corresponding conduits 52 , 106 , 108 for each axle or tandem axle of vehicle 12 .
  • axle distribution valves 86 , 88 , 90 are shown, individual tire distribution valves could be used in conjunction with axle distribution valves 86 , 88 , 90 or as an alternative to axle distribution valves 86 , 88 , 90 to further control the flow of fluid to and from individual tires 28 of vehicle 12 . Further, although only three axle distribution valves 86 , 88 , 90 are shown, the number of axle distribution valves may be varied depending upon the number of axles of vehicle 12 and to allow for greater individual control of the tires 28 of vehicle 12 .
  • Sensor 200 may be electrically integrated with electronic control unit 42 .
  • Sensor 200 is disposed in fluid communication with conduit assemblies for conducting fluid to and/or from tires 28 .
  • Sensor 200 may transmit a parameter signal indicative of a measured parameter associated with a corresponding tire 28 of vehicle 12 .
  • the parameter may be fluid pressure or another value, such as tire temperature, that may be indicative of tire pressure.
  • Control unit 42 controls fluid control circuit 36 .
  • Control unit 42 may include a microprocessor operating under the control of a set of programming instructions commonly referred to as software.
  • Electronic control unit 42 may include a memory 114 in which the programming instructions are stored.
  • Memory 114 also may contain identification codes for each tire 28 of vehicle 12 to uniquely identify the particular tire 28 to which a particular parameter signal corresponds.
  • Memory 114 also may be used to record tire pressure values or user inputs over a period of time to assist in evaluating tire pressure management.
  • Control unit 42 may receive input signals from sensor 200 , one or more load sensors 44 , speed sensor 46 , and operator control device 48 . Control unit 42 outputs a plurality of control signals to control valves 82 , 84 , 86 , 88 , 90 of fluid control circuit 36 and solenoid valve 72 of vacuum source 34 . Control unit 42 also may generate a plurality of output signals to a display device which may include a part of operator control device 48 or a freestanding device. The latter signals may be used to trigger the display pressure readings and/or deflection levels for each vehicle tire 28 , the load on vehicle 12 or a portion of it, and the speed of vehicle 12 .
  • the signals may also be used to trigger warnings to the operator of vehicle 12 in the event that pressure cannot be maintained in one of the vehicle tires 28 , the pressure exceeds or falls below predetermined maximum and minimum tire pressure values, or the pressure differs from a target tire pressure value by more than a predetermined amount.
  • Load sensors 44 provide an indication as to the load on vehicle 12 and, consequently, tires 28 of vehicle 12 , or the load on some portion of vehicle 12 and, consequently, select tires 28 of vehicle 12 .
  • Load sensors 44 are conventional in the art and load sensing may be provided in a variety of known ways, including through analysis of pneumatic pressure in the suspension of vehicle 12 , analysis of powertrain parameters, the use of displacement transducers, or the implementation of load beams and strain gauges.
  • Each load sensor 44 may provide one or more signals to electronic control unit 42 indicative of the load bearing on vehicle 12 or a portion thereof.
  • Electronic control unit 42 may initiate pressure adjustment in tires 28 of vehicle 12 in response to signals from load sensors 44 in a variety of ways. For example, electronic control unit may cause an increase or decrease in the pressure in one or more tires 28 responsive to a corresponding increase or decrease in vehicle load based on a variety of linear or non-linear functions.
  • One or more tire deflection tables may be stored in a memory, such as memory 114 , and accessed by electronic control unit 42 responsive to the signals from load sensors 44 .
  • Speed sensor 46 measures the speed of vehicle 12 to further control deflection levels for tires 28 . High deflection levels can create safety concerns and reduce tire life if maintained while vehicle 12 is operating at relatively high speeds. Speed sensor 46 is conventional in the art and provides a signal to electronic control unit 42 corresponding to speed.
  • Operator control device 48 may allow the operator of vehicle 12 to exert at least some level of control over system 10 .
  • Device 48 is conventional in the art and may include a plurality of input/output devices, such as a keypad, touch screen, switches or similar input devices, and a display screen, sound generator, lights or similar output devices.
  • device 48 permits an operator of vehicle 12 to transmit control signals to electronic control unit 42 to adjust pressure levels within the tires 28 of vehicle 12 .
  • the control signals may, for example, correspond to deflection levels for tires 28 of vehicle 12 .
  • the operator is able to adjust the deflection level of the tires 28 to correspond to the terrain over which vehicle 12 is traveling.
  • Such control is desirable to provide improved floatation and traction on certain terrain.
  • FIG. 4 diagrammatically shows a flow chart of the present method.
  • the method may be called upon initiation of system 10 , at. step S 0 .
  • Control unit 42 then passes control to step S 10 .
  • control unit 42 determines whether a flag has been set identifying system 10 as a monitor-only system.
  • control unit 42 is programmed with a default mode whereby control unit 42 presumes that system 10 is a maintenance, not a monitor, system.
  • control unit 42 senses a monitor flag has been set, system 10 is likely to have remotely located tire pressure sensors (not shown) dedicated to each tire 28 , and not fluid control mechanisms, such as solenoids or conduit assemblies for supplying or removing fluid from tires 28 .
  • monitor mode control unit 42 is not permitted to execute routines which would require the foregoing fluid control mechanisms.
  • control unit 42 determines whether control unit 42 is a monitor system or not. If control unit 42 does not sense a flag indicating that system 10 is a monitor system, control unit 42 passes control along branch B 10 to step S 15 .
  • control unit 42 may check the contents of a target tire pressure variable stored in a memory accessible to control unit 42 . If a target tire pressure variable exists, control unit 42 passes control along branch B 25 to step S 20 . If a target tire pressure variable does not exist, control unit 42 passes control along branch B 20 to step S 35 , described below.
  • the invention provides for executing a tire pressure maintenance program (not shown).
  • a tire pressure maintenance program is based on that described in the U.S. Patent applications filed contemporaneously herewith associated with Ser. Nos. 10/004,751 and 10/004,719.
  • step S 25 the invention provides for ascertaining whether the requisite remotely-located, tire-specific pressure sensors (not shown), described above with respect to step S 10 , are programed to be controlled by control unit 42 , as described with respect to step S 10 . If control unit 42 detects that the sensors are programed into a memory thereof, control unit 42 passes control along branch B 45 to step S 30 . If the sensors are not programed, control unit 42 passes control to and along branches B 40 and B 20 to step S 35 , described below.
  • the invention provides for executing a monitoring program (not shown) to receive and process signals transmitted from the sensors, such as signals corresponding to conduit assembly or tire pressure.
  • the invention provides for illuminating a lamp.
  • the illuminated lamp is intended to alert an operator that no target tire pressure has been established, effectively disabling system 10 from being able to maintain an appropriate tire pressure.
  • the lamp remains illuminated indefinitely until the operator elects to have control unit 42 initiate a target tire pressure learning routine. Control unit 42 then passes control to step S 40 .
  • the invention provides for determining whether the operator desires to have control unit 42 initiate a routine to learn a target tire pressure. Control waits indefinitely, with the warning lamp illuminated, for operator input. Once the operator has been alerted of a target tire pressure value deficiency in step S 35 , the operator, satisfied with the current tire pressure, could immediately instruct control unit 42 to accept same as the target tire pressure. Operator also could adjust tire pressure in tires 28 and thereafter instruct control unit 42 to accept the adjusted tire pressure as the target tire pressure. If the operator elects not to have control unit 42 learn a target tire pressure, control loops around and passes control along branches B 30 and B 20 back to step S 35 , described above. If the operator elects to have control unit 42 learn a target tire pressure, control unit 42 passes control along branch B 35 to step S 45 to initiate a warning sequence prior to initiating the routine to learn a target tire pressure.
  • step S 45 the invention provides for extinguishing the lamp illuminated in step S 35 . This frees-the lamp from the control established thereover at step S 35 and allows for subsequent control. Control unit 42 then passes control to step S 55 , described below.
  • the invention provides for initiating a target tire pressure learning routine upon the election of an operator to have control unit 42 learn a target tire pressure, other than when control unit 42 detects that no target tire pressure value exists. For example, the operator may encounter new surface conditions for which a different target tire pressure would be more appropriate. The operator then may initiate an inflation or deflation routine, or manually undertake same, then instruct control unit 42 to learn the recently established pressure as the new target tire pressure. Control unit 42 then passes control to step S 55 .
  • the invention provides for illuminating a lamp for a duration.
  • the illuminated lamp is intended to alert the operator that control unit 42 is about to initiate a target tire pressure learning routine.
  • the operator thus alerted, cognizant that a new target tire pressure value is about to be established, would refrain from adjusting tire pressure during the impending learning routine.
  • the operator also may have an opportunity to cancel the anticipated initiation of a learning routine.
  • Control unit 42 then passes control to step S 60 .
  • step S 60 the invention provides for intermittently illuminating the lamp for a second duration. This alerts the operator that control unit 42 is executing the learning routine.
  • the duration extends through step S 140 unless, at step S 110 a line leak fault is determined to exist, in which case the lamp is illuminated continuously, as described above with respect to step S 35 .
  • control unit 42 passes control to step S 65 .
  • step S 65 the invention provides for determining whether requisite solenoids are present. This ensures that solenoids 82 , 84 , 86 , 88 and 90 are functioning and electronically operable under the control of control unit 42 . This also verifies whether control unit 42 , which by default operates under the assumption that system 10 is a maintenance-type system, described above with respect to step S 10 . Accordingly, if control unit 42 detects that the requisite solenoids are present, control unit 42 passes control along branch B 50 to step S 70 , described below. If control unit 42 detects that the requisite solenoids are not present, control unit 42 passes control along branch B 55 to step S 30 , described above.
  • step S 70 the invention provides for setting a “low supply” flag.
  • Setting the “low supply” flag preliminarily to actually checking the supply pressure in fluid source 32 serves as a safety measure designed ensure that the flag is set despite problems that may develop during the ensuing supply pressure checking routine.
  • the “low supply” flag is cleared only if the supply pressure checking routine executes normally and returns an appropriate value. Thus, if the supply pressure checking routine returns an incorrect value or does not execute properly, and supply pressure is insufficient to bring the pressure of tires 28 up to the target tire pressure, as determined in step S 85 described below, the operator is alerted that a supply pressure problem exists. Control unit 42 then passes control to step S 75 .
  • step S 75 the invention provides for supplying compressed fluid from fluid source 32 to, for example, conduit assemblies in fluid communication with sensor 200 .
  • This step is intended to enable sensor 200 to ascertain the pressure of the fluid provided by fluid source 32 .
  • control unit 42 instructs solenoid 82 to open, and solenoids 86 , 88 and 90 to close, thereby enabling fluid communication among fluid source 32 , conduit assemblies for conducting fluid to solenoids 86 , 88 and 90 , and sensor 200 , for a brief duration.
  • Control unit 42 then passes control to step S 80 .
  • step S 80 the invention provides for ascertaining the pressure of fluid supplied by the pulse provided in step S 75 and saving same as a supply pressure value.
  • Control unit 42 then passes control to step S 85 .
  • the invention provides for ascertaining whether the supply pressure is greater than a manufacturer-configured, or manufacturer designated, minimum supply pressure value.
  • the minimum supply pressure value represents a minimum pressure needed to be able to ensure correct measurement of fluid pressure in tires 28 to enable establishing a new target tire pressure. If the supply pressure value, obtained in step S 80 , is not greater than the manufacturer-configured minimum supply pressure, control unit 42 cycles back through step S 75 to continue to monitor supply pressure in fluid source 32 , therefore control unit 42 passes control along branch B 60 to step S 75 .
  • An alternative embodiment of the invention provides for establishing a fault or otherwise alerting the operator or terminating the routine if the supply pressure is inadequate to allow for measuring fluid pressure in tires 28 . If the supply pressure value is greater than the minimum supply pressure, control unit 42 passes control along branch B 65 to step S 90 .
  • step S 90 the invention provides for clearing the “low supply” flag. Because supply pressure is adequate to initiate tire inflation or maintenance; the “low supply” flag set as a precaution in step S 70 no longer is needed or appropriate. Control unit 42 then passes control to step S 95 .
  • the invention provides for pressurizing the conduit assemblies in fluid communication with control valve assembly 30 .
  • the pulse has a duration, configured or designated by the manufacturer, sufficient to pressurize the conduit assemblies sufficiently to open control valve assembly 30 and initiate fluid communication with tires 28 , but, preferably, not increase the pressure of tires 28 . In practice, pressure in tires 28 may increase slightly, but such should be minimized.
  • Control unit 42 instructs solenoids 82 and 86 , 88 and/or 90 to open, and solenoid 84 to close, thereby initiating fluid communication among fluid source 32 , tires 28 and conduit assemblies therebetween, for the pulse duration. After the pulse duration, control unit 42 passes control to step S 100 .
  • step S 100 the invention provides for allowing the conduit assemblies and tires 28 to reach equilibrium.
  • Control unit 42 closes solenoid 82 and maintains solenoids 86 , 88 and/or 90 open for a manufacturer-configured, or manufacturer designated, duration. Thereafter, control unit 42 passes control to step S 105 .
  • the invention provides for ascertaining the gage pressure in conduit assemblies. Since the conduit assemblies are at equilibrium with tires 28 , the gage pressure measured in the conduit assemblies equals the current fluid pressure in tires 28 . The pressure in the conduit assemblies, preferably, is measured with sensor 200 . Control unit 42 saves the pressure measurement as a temporary variable “temp 1 .” Control unit 42 then passes control to step S 110 .
  • the invention provides for determining whether the current tire pressure is less than a new target tire pressure minimum value.
  • the new target tire pressure minimum value is needed to ensure proper functioning of other components of system 10 , or other systems, such as the functioning of pressure protection valves (not shown) designed to ensure that higher priority systems, such as braking systems, enjoy superior rights to fluid source 32 .
  • the new target tire pressure minimum value may be configured or designated by the manufacturer. If the current tire pressure, “temp 1 ,” is not less than the new target tire pressure minimum value, control unit 42 passes control along branch B 70 to step S 125 , described below. If the current tire pressure is less than the new target tire pressure minimum value, control unit 42 passes control along branch B 75 to step S 115 .
  • step S 115 the invention provides for logging a line leak fault. This alerts the operator that elements of system 10 , such as the conduit assemblies or solenoids, have failed or merit servicing.
  • Control unit 42 then passes control to and along branches B 30 and B 20 back to step S 35 , described above.
  • step S 120 the invention provides for initiating a line leak checking routine. Similar to step S 100 , control unit 42 instructs solenoid 82 to close and solenoids 86 , 88 and/or 90 to open for a manufacturer-configured, or manufacturer designated, duration. The duration of this step is longer than the duration of step S 100 to allow sufficient time for an appreciable amount of fluid in the conduit assemblies to escape from a significant leak therethrough. Thereafter, control unit 42 passes control to step S 125 .
  • step S 125 the invention provides for ascertaining the pressure of fluid remaining in the conduit assemblies following the duration of step S 120 .
  • the pressure in the conduit assemblies preferably, is measured with sensor 200 .
  • Control unit 42 then saves the pressure measurement as a temporary variable “temp 2 .”
  • Control unit 42 then passes control to step S 130 .
  • the invention provides for determining whether a difference between the pressure measured prior to the line leak checking routine and the pressure measured thereafter exceeds a limit. If the pre-line leak check pressure exceeds the post-line leak check pressure, the conduit assemblies exhibit significant fluid, hence fluid pressure, loss. Therefore, if the difference between “temp 1 ” and “temp 2 ” exceeds a manufacturer-configured, or manufacturer designated, limit, control unit 42 then passes control to and along branches B 85 and B 75 to step S 115 , described above. If the difference between “temp 1 ” and “temp 2 ” does not exceed the limit, control unit 42 passes control along branch B 80 to step S 135 .
  • step S 135 the invention provides for establishing the current tire pressure as the target tire pressure.
  • Control unit 42 recalls the value of temporary variable “temp 1 ,” described in step S 105 , and saves same in the tire target tire pressure variable.
  • Temporary variable “temp 2 ” is not stored as the target tire pressure because such may reflect a pressure value diminished due to line leaks in the conduit assemblies.
  • Control unit 42 then passes control to step S 140 .
  • control unit 42 provides for informing the operator that control unit 42 completed the target tire pressure learning routine.
  • Control unit 42 illuminates a lamp for a duration, then extinguishes the lamp.
  • Control unit also displays the value of the target tire pressure established.
  • Control unit 42 may provide the target tire pressure information to another, such as a machine, via any data transmission convention, which may process same, or an individual, via any broadcast convention, interested in same.
  • Control unit 42 then passes control to step S 145 .
  • step S 145 the invention provides for returning control to a main program (not shown).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Fluid Pressure (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Control Of Fluid Pressure (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Fuel-Injection Apparatus (AREA)
US10/006,276 2001-12-04 2001-12-04 Target tire pressure learning method Expired - Lifetime US6666078B1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US10/006,276 US6666078B1 (en) 2001-12-04 2001-12-04 Target tire pressure learning method
MXPA04006518A MXPA04006518A (es) 2001-12-04 2002-11-26 Metodo de entrenamiento de presion objetivo de neumatico.
AT02784612T ATE385914T1 (de) 2001-12-04 2002-11-26 Lernverfahren des solldrucks zur druckregelung
CNB028278062A CN100335880C (zh) 2001-12-04 2002-11-26 目标轮胎压力获知方法
CA2473968A CA2473968C (en) 2001-12-04 2002-11-26 Target tire pressure learning method
DE60225049T DE60225049T2 (de) 2001-12-04 2002-11-26 Verfahren zum steuern eines reifendrucks
PCT/US2002/037934 WO2003047888A1 (en) 2001-12-04 2002-11-26 Target tire pressure learning method
EP02784612A EP1453689B1 (de) 2001-12-04 2002-11-26 Lernverfahren des solldrucks zur druckregelung
BRPI0215562-1A BR0215562B1 (pt) 2001-12-04 2002-11-26 método para controlar pressão de pneu.
AU2002346544A AU2002346544A1 (en) 2001-12-04 2002-11-26 Target tire pressure learning method

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US10/006,276 US6666078B1 (en) 2001-12-04 2001-12-04 Target tire pressure learning method

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EP (1) EP1453689B1 (de)
CN (1) CN100335880C (de)
AT (1) ATE385914T1 (de)
AU (1) AU2002346544A1 (de)
BR (1) BR0215562B1 (de)
CA (1) CA2473968C (de)
DE (1) DE60225049T2 (de)
MX (1) MXPA04006518A (de)
WO (1) WO2003047888A1 (de)

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WO2004036166A2 (en) * 2002-10-17 2004-04-29 Measurement Specialities, Inc. Recall mechanism for a pressure gauge
US20040173296A1 (en) * 2003-03-06 2004-09-09 White Jay D. Tire inflation system apparatus and method
US20060037382A1 (en) * 2004-08-18 2006-02-23 Falchi Mauro C Method and apparatus to detect leaks in expansion vessel
US20070186636A1 (en) * 2006-02-13 2007-08-16 Wise Robert W Precision inflation control device
US7273082B2 (en) 2004-03-05 2007-09-25 Hendrickson Usa, L.L.C. Tire inflation system apparatus and method
US20070295065A1 (en) * 2006-06-27 2007-12-27 Bfs Diversified Products, Llc Weight sensing system and method for vehicles with non-fluid springs
US20080066533A1 (en) * 2006-09-19 2008-03-20 Beverly James A Tire inflation method
US20080245455A1 (en) * 2007-04-06 2008-10-09 Michelin Recherche Et Technique S.A. Method of detecting an occurrence of hydroplaning of a tire on a road
US20110017317A1 (en) * 2007-07-17 2011-01-27 Horst Pritschet Pneumatic tire valve device and the system and the process of setting the tire pressure
US8151127B2 (en) 2000-07-26 2012-04-03 Bridgestone Americas Tire Operations, Llc System for conserving battery life in a battery operated device
US8266465B2 (en) 2000-07-26 2012-09-11 Bridgestone Americas Tire Operation, LLC System for conserving battery life in a battery operated device
US20130325261A1 (en) * 2012-06-04 2013-12-05 Claas Selbstfahrende Erntemaschinen Gmbh Method for adjusting tire pressure
US20150075672A1 (en) * 2013-09-18 2015-03-19 Arvinmeritor Technology, Llc Tire Inflation System and Method of Control
US20150202931A1 (en) * 2014-01-21 2015-07-23 Arvinmeritor Technology, Llc Tire Inflation System and Method of Control
US9132704B2 (en) 2010-07-30 2015-09-15 Hendrickson Usa, L.L.C. Constant pressure pneumatic balancing tire inflation system
US9493042B2 (en) 2013-03-15 2016-11-15 Dana Heavy Vehicle Systems Group, Llc Method of venting a tire inflation system and control unit utilized therein
US20160375730A1 (en) * 2013-12-06 2016-12-29 Dana Heavy Vehicle Systems Group, Llc Method of determining tire pressure
US9815340B2 (en) 2015-04-30 2017-11-14 Arvinmeritor Technology, Llc Tire inflation system and method of control
US20190061459A1 (en) * 2016-03-30 2019-02-28 Wabco Europe Bvba Compressed air supply system
US10343479B2 (en) * 2014-08-22 2019-07-09 Wabco Gmbh Pneumatic circuit for passenger car pneumatic suspension system
US10442256B2 (en) * 2016-03-07 2019-10-15 Deere & Company System for tire pressure monitoring for a utility vehicle
US10549585B2 (en) 2017-02-23 2020-02-04 Tire Pressure Control International Ltd Tire pressure control system
US20220234397A1 (en) * 2016-09-06 2022-07-28 Aktv8 LLC System and method for tire leak detection
US11752811B2 (en) 2018-10-17 2023-09-12 Tire Pressure Control International Ltd. Tire pressure control valve assembly

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DE102009038100A1 (de) * 2009-08-19 2011-02-24 Beru Ag Verfahren und System zur Reifendrucküberwachung
DE102011016640A1 (de) * 2011-04-09 2012-10-11 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Vorrichtung und Verfahren zur Vorgabe eines Wertes für ein Kraftfahrzeug
CN103237668B (zh) * 2011-11-11 2015-08-19 陈贺章 轮胎气压调节与防止爆胎装置以及安装了所述装置的车辆

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US8151127B2 (en) 2000-07-26 2012-04-03 Bridgestone Americas Tire Operations, Llc System for conserving battery life in a battery operated device
US8266465B2 (en) 2000-07-26 2012-09-11 Bridgestone Americas Tire Operation, LLC System for conserving battery life in a battery operated device
WO2004036166A3 (en) * 2002-10-17 2004-09-30 Measurement Specialities Inc Recall mechanism for a pressure gauge
WO2004036166A2 (en) * 2002-10-17 2004-04-29 Measurement Specialities, Inc. Recall mechanism for a pressure gauge
US20040173296A1 (en) * 2003-03-06 2004-09-09 White Jay D. Tire inflation system apparatus and method
US7273082B2 (en) 2004-03-05 2007-09-25 Hendrickson Usa, L.L.C. Tire inflation system apparatus and method
US20060037382A1 (en) * 2004-08-18 2006-02-23 Falchi Mauro C Method and apparatus to detect leaks in expansion vessel
US20070186636A1 (en) * 2006-02-13 2007-08-16 Wise Robert W Precision inflation control device
US7331221B2 (en) 2006-02-13 2008-02-19 Robert W. Wise Precision inflation control device
US20070295065A1 (en) * 2006-06-27 2007-12-27 Bfs Diversified Products, Llc Weight sensing system and method for vehicles with non-fluid springs
US7398668B2 (en) 2006-06-27 2008-07-15 Bfs Diversified Products, Llc Weight sensing system and method for vehicles with non-fluid springs
US20080066533A1 (en) * 2006-09-19 2008-03-20 Beverly James A Tire inflation method
US7437920B2 (en) 2006-09-19 2008-10-21 Dana Heavy Vehicle Systems Group, Llc Tire inflation method
US20080245455A1 (en) * 2007-04-06 2008-10-09 Michelin Recherche Et Technique S.A. Method of detecting an occurrence of hydroplaning of a tire on a road
US20110017317A1 (en) * 2007-07-17 2011-01-27 Horst Pritschet Pneumatic tire valve device and the system and the process of setting the tire pressure
US9132704B2 (en) 2010-07-30 2015-09-15 Hendrickson Usa, L.L.C. Constant pressure pneumatic balancing tire inflation system
US8781678B2 (en) * 2012-06-04 2014-07-15 Claas Selbstfahrende Erntemaschinen Gmbh Method for adjusting tire pressure
US20130325261A1 (en) * 2012-06-04 2013-12-05 Claas Selbstfahrende Erntemaschinen Gmbh Method for adjusting tire pressure
US9493042B2 (en) 2013-03-15 2016-11-15 Dana Heavy Vehicle Systems Group, Llc Method of venting a tire inflation system and control unit utilized therein
US20150075672A1 (en) * 2013-09-18 2015-03-19 Arvinmeritor Technology, Llc Tire Inflation System and Method of Control
US10391824B2 (en) * 2013-09-18 2019-08-27 Arvinmeritor Technology, Llc Tire inflation system and method of control
US20160375730A1 (en) * 2013-12-06 2016-12-29 Dana Heavy Vehicle Systems Group, Llc Method of determining tire pressure
US9694630B2 (en) * 2013-12-06 2017-07-04 Dana Heavy Vehicle Systems Group, Llc Method of determining tire pressure
US20150202931A1 (en) * 2014-01-21 2015-07-23 Arvinmeritor Technology, Llc Tire Inflation System and Method of Control
US9278587B2 (en) * 2014-01-21 2016-03-08 Arvinmeritor Technology, Llc Tire inflation system and method of control
US10343479B2 (en) * 2014-08-22 2019-07-09 Wabco Gmbh Pneumatic circuit for passenger car pneumatic suspension system
US9815340B2 (en) 2015-04-30 2017-11-14 Arvinmeritor Technology, Llc Tire inflation system and method of control
US10442256B2 (en) * 2016-03-07 2019-10-15 Deere & Company System for tire pressure monitoring for a utility vehicle
US20190061459A1 (en) * 2016-03-30 2019-02-28 Wabco Europe Bvba Compressed air supply system
US10899189B2 (en) * 2016-03-30 2021-01-26 Wabco Europe Bvba Compressed air supply system
US20220234397A1 (en) * 2016-09-06 2022-07-28 Aktv8 LLC System and method for tire leak detection
US10549585B2 (en) 2017-02-23 2020-02-04 Tire Pressure Control International Ltd Tire pressure control system
US11752811B2 (en) 2018-10-17 2023-09-12 Tire Pressure Control International Ltd. Tire pressure control valve assembly

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AU2002346544A1 (en) 2003-06-17
ATE385914T1 (de) 2008-03-15
DE60225049T2 (de) 2008-05-15
BR0215562B1 (pt) 2011-03-09
CN1617806A (zh) 2005-05-18
CA2473968A1 (en) 2003-06-12
CA2473968C (en) 2011-01-25
BR0215562A (pt) 2006-06-06
CN100335880C (zh) 2007-09-05
WO2003047888A1 (en) 2003-06-12
EP1453689B1 (de) 2008-02-13
DE60225049D1 (de) 2008-03-27
MXPA04006518A (es) 2004-12-07
EP1453689A1 (de) 2004-09-08

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